@goose you mistaken the post from @jymc above as my post. I never have a chance to hear any Esoteric equipment in the past. So I cannot comment on Esoteric.
@jymc may I know what feature/function of the Mark Levinson 519 as a streamer that you like? I might be looking for a higher-end streamer in the next 6 months or so. Currently the Nagra streamer is one of my target, but I don’t like the fact, the Nagra only offer Coaxial output (for connection to non-Nagra DAC). I wish Nagra has at least a USB digital output.
For DAC, I think I am set for the next decade with the DAC inside the MCD-12000. You should try to listen to the MCD12000 at a McIntosh dealer and compare it to your Mark Levinson (by bringing your Mark Levinson to the McIntosh dealer) for a direct comparison. It might not be as accurate as doing it in your home, but you can at least confirm whether the MCD12000 tube output will help with the "forward" high frequency attenuation.